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        <li class="chapter " data-level="1.1" data-path="../">
            
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                    MLSQL Stack
            
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        <li class="header">产品信息</li>
        
        
    
        <li class="chapter " data-level="2.1" >
            
                <a target="_blank" href="http://blog.mlsql.tech">
            
                    
                    MLSQL官方博客
            
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        <li class="chapter " data-level="2.2" >
            
                <a target="_blank" href="http://blog.mlsql.tech/blog/demo.html">
            
                    
                    MLSQL Stack体验站点
            
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        <li class="header">版本以及部署</li>
        
        
    
        <li class="chapter " data-level="3.1" data-path="../release-notes/">
            
                <a href="../release-notes/">
            
                    
                    所有版本
            
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        <li class="chapter " data-level="3.1.1" data-path="../release-notes/version.html">
            
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                    MLSQL Stack版本管理策略
            
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        <li class="chapter " data-level="3.1.2" data-path="../release-notes/2.0.1.html">
            
                <a href="../release-notes/2.0.1.html">
            
                    
                    MLSQL Stack 2.0.1版发布
            
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        <li class="chapter " data-level="3.1.3" data-path="../release-notes/2.0.0.html">
            
                <a href="../release-notes/2.0.0.html">
            
                    
                    MLSQL Stack 2.0.0版发布
            
                </a>
            

            
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        <li class="chapter " data-level="3.1.4" data-path="../release-notes/2.0.1-bug.html">
            
                <a href="../release-notes/2.0.1-bug.html">
            
                    
                    MLSQL Stack 2.0.1 Bug 合集
            
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        <li class="chapter " data-level="3.1.5" data-path="../release-notes/2.0.0-bug.html">
            
                <a href="../release-notes/2.0.0-bug.html">
            
                    
                    MLSQL Stack 2.0.0 Bug 合集
            
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            </ul>
            
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        <li class="chapter " data-level="3.2" data-path="../howtouse/">
            
                <a href="../howtouse/">
            
                    
                    基本安装
            
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        <li class="chapter " data-level="3.2.1" data-path="../howtouse/install.html">
            
                <a href="../howtouse/install.html">
            
                    
                    MLSQL Console 安装
            
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        <li class="chapter " data-level="3.2.2" data-path="../howtouse/setup.html">
            
                <a href="../howtouse/setup.html">
            
                    
                    MLSQL Console 初始配置
            
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        <li class="chapter " data-level="3.2.3" data-path="../howtouse/engine/">
            
                <a href="../howtouse/engine/">
            
                    
                    MLSQL Engine 安装与配置
            
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        <li class="chapter " data-level="3.2.3.1" data-path="../howtouse/engine/configuration.html">
            
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                    启动参数详解
            
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        <li class="chapter " data-level="3.2.3.2" data-path="../howtouse/engine/deploy.html">
            
                <a href="../howtouse/engine/deploy.html">
            
                    
                    Local
            
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        <li class="chapter " data-level="3.2.3.3" data-path="../howtouse/engine/k8s_deploy.html">
            
                <a href="../howtouse/engine/k8s_deploy.html">
            
                    
                    K8s部署
            
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        <li class="chapter " data-level="3.2.3.4" data-path="../howtouse/engine/yarn_deploy.html">
            
                <a href="../howtouse/engine/yarn_deploy.html">
            
                    
                    Yarn部署
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">操作指南</li>
        
        
    
        <li class="chapter " data-level="4.1" data-path="../analysis-workshop/">
            
                <a href="../analysis-workshop/">
            
                    
                    Analysis Workshop使用
            
                </a>
            

            
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        <li class="chapter " data-level="4.1.1" data-path="../analysis-workshop/interface.html">
            
                <a href="../analysis-workshop/interface.html">
            
                    
                    软件界面介绍
            
                </a>
            

            
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        <li class="chapter " data-level="4.1.2" data-path="../analysis-workshop/admin-engine.html">
            
                <a href="../analysis-workshop/admin-engine.html">
            
                    
                    Admin管理后台之Engine配置
            
                </a>
            

            
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        <li class="chapter " data-level="4.1.3" data-path="../analysis-workshop/simple-example.html">
            
                <a href="../analysis-workshop/simple-example.html">
            
                    
                    简单使用示例
            
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        <li class="chapter " data-level="4.1.4" data-path="../analysis-workshop/pivot.html">
            
                <a href="../analysis-workshop/pivot.html">
            
                    
                    透视表
            
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        <li class="chapter " data-level="4.1.5" data-path="../analysis-workshop/dash.html">
            
                <a href="../analysis-workshop/dash.html">
            
                    
                    可视化
            
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        <li class="chapter " data-level="4.1.6" data-path="../analysis-workshop/window.html">
            
                <a href="../analysis-workshop/window.html">
            
                    
                    使用窗口进行数据分析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.7" data-path="../analysis-workshop/complex-filter.html">
            
                <a href="../analysis-workshop/complex-filter.html">
            
                    
                    复杂组合条件过滤
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.8" data-path="../analysis-workshop/ds-mysql.html">
            
                <a href="../analysis-workshop/ds-mysql.html">
            
                    
                    MySQL数据库配置
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.9" data-path="../analysis-workshop/json-fields.html">
            
                <a href="../analysis-workshop/json-fields.html">
            
                    
                    Json字段展开
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.10" data-path="../analysis-workshop/aw-plugin.html">
            
                <a href="../analysis-workshop/aw-plugin.html">
            
                    
                    用MLSQL为Analysis Workshop开发插件
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="4.2" data-path="../console/">
            
                <a href="../console/">
            
                    
                    MLSQL语言控制台使用
            
                </a>
            

            
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        <li class="chapter " data-level="4.2.1" data-path="../console/interface.html">
            
                <a href="../console/interface.html">
            
                    
                    界面简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.2.2" data-path="../console/simple-example.html">
            
                <a href="../console/simple-example.html">
            
                    
                    简单使用示例
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">MLSQL语法以及编程教程</li>
        
        
    
        <li class="chapter " data-level="5.1" data-path="./">
            
                <a href="./">
            
                    
                    MLSQL语法手册
            
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        <li class="chapter active" data-level="5.1.1" data-path="set.html">
            
                <a href="set.html">
            
                    
                    Set语法
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.2" data-path="load.html">
            
                <a href="load.html">
            
                    
                    Load语法
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.3" data-path="select.html">
            
                <a href="select.html">
            
                    
                    Select语法
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.4" data-path="et_statement.html">
            
                <a href="et_statement.html">
            
                    
                    Train/Run/Predict语法
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.5" data-path="register.html">
            
                <a href="register.html">
            
                    
                    Register语法
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.6" data-path="save.html">
            
                <a href="save.html">
            
                    
                    Save语法
            
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        </li>
    
        <li class="chapter " data-level="5.1.7" data-path="macro.html">
            
                <a href="macro.html">
            
                    
                    宏语法
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.8" data-path="include.html">
            
                <a href="include.html">
            
                    
                    Include语法
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.9" >
            
                <a target="_blank" href="http://blog.mlsql.tech/blog/mlsql-ifelse.html">
            
                    
                    分支语句
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.10" data-path="analyze.html">
            
                <a href="analyze.html">
            
                    
                    MLSQL语法解析接口
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="5.2" data-path="../batch/">
            
                <a href="../batch/">
            
                    
                    MLSQL批处理编程
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.2.1" data-path="../datahouse/">
            
                <a href="../datahouse/">
            
                    
                    MLSQL数仓/数据湖使用
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.2.1.1" data-path="../datahouse/hive.html">
            
                <a href="../datahouse/hive.html">
            
                    
                    Hive加载和存储
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.2.1.2" data-path="../datahouse/delta.html">
            
                <a href="../datahouse/delta.html">
            
                    
                    Delta加载和存储以及流式支持
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.2.1.3" data-path="../datahouse/binlog.html">
            
                <a href="../datahouse/binlog.html">
            
                    
                    MySQL Binlog同步
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="5.2.2" data-path="../datasource/">
            
                <a href="../datasource/">
            
                    
                    加载和存储多种数据源
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.2.2.1" data-path="../datasource/jdbc.html">
            
                <a href="../datasource/jdbc.html">
            
                    
                    JDBC
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.2.2.2" data-path="../datasource/es.html">
            
                <a href="../datasource/es.html">
            
                    
                    ElasticSearch
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.2.2.3" data-path="../datasource/solr.html">
            
                <a href="../datasource/solr.html">
            
                    
                    Solr
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.2.2.4" data-path="../datasource/hbase.html">
            
                <a href="../datasource/hbase.html">
            
                    
                    HBase
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.2.2.5" data-path="../datasource/mongodb.html">
            
                <a href="../datasource/mongodb.html">
            
                    
                    MongoDB
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.2.2.6" data-path="../datasource/file.html">
            
                <a href="../datasource/file.html">
            
                    
                    Parquet/Json/Text/Xml/Csv
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.2.2.7" data-path="../datasource/mlsql_source.html">
            
                <a href="../datasource/mlsql_source.html">
            
                    
                    jsonStr/script/mlsqlAPI/mlsqlConf
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="5.2.3" data-path="../system_udf/">
            
                <a href="../system_udf/">
            
                    
                    内置常见UDF
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.2.3.1" data-path="../system_udf/http.html">
            
                <a href="../system_udf/http.html">
            
                    
                    http请求
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.2.3.2" data-path="../system_udf/vec.html">
            
                <a href="../system_udf/vec.html">
            
                    
                    常见函数
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="5.2.4" data-path="../process/">
            
                <a href="../process/">
            
                    
                    一些有用的内置ET
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.2.4.1" data-path="../process/estimator_transformer/TreeBuildExt.html">
            
                <a href="../process/estimator_transformer/TreeBuildExt.html">
            
                    
                    计算复杂的父子关系
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.2.4.2" data-path="../process/estimator_transformer/RepartitionExt.html">
            
                <a href="../process/estimator_transformer/RepartitionExt.html">
            
                    
                    改变表的分区数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.2.4.3" data-path="../process/estimator_transformer/SendMessage.html">
            
                <a href="../process/estimator_transformer/SendMessage.html">
            
                    
                    如何发送邮件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.2.4.4" data-path="../process/estimator_transformer/mlsql-watcher.html">
            
                <a href="../process/estimator_transformer/mlsql-watcher.html">
            
                    
                    数据采集组件mlsql-watcher使用
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="5.3" data-path="../stream/">
            
                <a href="../stream/">
            
                    
                    MLSQL流编程
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.3.1" data-path="../stream/datasource.html">
            
                <a href="../stream/datasource.html">
            
                    
                    Kafka和MockStream
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.3.2" data-path="../stream/kakfa_tool.html">
            
                <a href="../stream/kakfa_tool.html">
            
                    
                    MLSQL Kafka小工具集锦
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.3.3" data-path="../stream/data_convert.html">
            
                <a href="../stream/data_convert.html">
            
                    
                    自动将Kafka中的JSON数据展开为表
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.3.4" data-path="../stream/query_kafka.html">
            
                <a href="../stream/query_kafka.html">
            
                    
                    如何高效的AdHoc查询Kafka
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.3.5" data-path="../stream/callback.html">
            
                <a href="../stream/callback.html">
            
                    
                    如何设置流式计算回调
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.3.6" data-path="../stream/batch.html">
            
                <a href="../stream/batch.html">
            
                    
                    如何对流的结果以批的形式保存
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.3.7" data-path="../stream/window_wartermark.html">
            
                <a href="../stream/window_wartermark.html">
            
                    
                    window/watermark的使用
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.3.8" data-path="../stream/stream_mysql_update.html">
            
                <a href="../stream/stream_mysql_update.html">
            
                    
                    如何使用MLSQL流式更新MySQL数据
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.3.9" data-path="../stream/web_console.html">
            
                <a href="../stream/web_console.html">
            
                    
                    流结果输出到WebConsole
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="5.4" data-path="../ml/">
            
                <a href="../ml/">
            
                    
                    MLSQL机器学习编程
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.4.1" data-path="../feature/">
            
                <a href="../feature/">
            
                    
                    特征工程
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.4.1.1" data-path="../feature/nlp.html">
            
                <a href="../feature/nlp.html">
            
                    
                    文本向量化
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.4.1.1.1" data-path="../feature/tfidf.html">
            
                <a href="../feature/tfidf.html">
            
                    
                    TFIDF
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.4.1.1.2" data-path="../feature/word2vec.html">
            
                <a href="../feature/word2vec.html">
            
                    
                    Word2Vec
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="5.4.1.2" data-path="../feature/scale.html">
            
                <a href="../feature/scale.html">
            
                    
                    特征平滑
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.4.1.3" data-path="../feature/normalize.html">
            
                <a href="../feature/normalize.html">
            
                    
                    归一化
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.4.1.4" data-path="../feature/confusion_matrix.html">
            
                <a href="../feature/confusion_matrix.html">
            
                    
                    混淆矩阵
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.4.1.5" data-path="../feature/some_extract.html">
            
                <a href="../feature/some_extract.html">
            
                    
                    QQ/电话/邮件抽取
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.4.1.6" data-path="../feature/discretizer/">
            
                <a href="../feature/discretizer/">
            
                    
                    离散化
            
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                    Bucketizer
            
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                    Quantile
            
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                    Map转化为向量
            
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                    数据集切分
            
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                    数据处理
            
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                    结合Python读取Excel
            
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                    结合Python保存Excel
            
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                    K8s下的Python资源限制
            
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<p>&#x53D8;&#x91CF;&#x8BBE;&#x7F6E;&#x5E7F;&#x6CDB;&#x7684;&#x5B58;&#x5728;&#x4E8E;&#x5404;&#x79CD;&#x8BED;&#x8A00;&#x4E2D;&#x3002;MLSQL&#x901A;&#x8FC7;Set&#x8BED;&#x6CD5;&#x6765;&#x5B8C;&#x6210;&#x53D8;&#x91CF;&#x8BBE;&#x7F6E;&#x3002;</p>
<h2 id="&#x57FA;&#x7840;&#x5E94;&#x7528;"><a name="&#x57FA;&#x7840;&#x5E94;&#x7528;" class="anchor-navigation-ex-anchor" href="#&#x57FA;&#x7840;&#x5E94;&#x7528;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x57FA;&#x7840;&#x5E94;&#x7528;</h2>
<pre><code class="lang-sql"><span class="hljs-keyword">set</span> hello=<span class="hljs-string">&quot;world&quot;</span>;
</code></pre>
<p>&#x6B64;&#x65F6;&#x4F60;&#x8FD0;&#x884C;&#x540E;&#x4E0D;&#x4F1A;&#x6709;&#x4EFB;&#x4F55;&#x8F93;&#x51FA;&#x7ED3;&#x679C;&#x3002;&#x56E0;&#x4E3A;&#x4ED6;&#x4EC5;&#x4EC5;&#x662F;&#x8BBE;&#x7F6E;&#x4E86;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;&#x3002;&#x90A3;&#x4E48;&#x600E;&#x4E48;&#x4F7F;&#x7528;&#x5462;&#xFF1F;</p>
<p>&#x4F60;&#x53EF;&#x4EE5;&#x5728;&#x540E;&#x7EED;&#x7684;&#x8BED;&#x6CD5;&#x4E2D;&#x4F7F;&#x7528;&#xFF0C;&#x6BD4;&#x5982;&#xFF1A;</p>
<pre><code class="lang-sql">
<span class="hljs-keyword">set</span> hello=<span class="hljs-string">&quot;world&quot;</span>;

<span class="hljs-keyword">select</span> <span class="hljs-string">&quot;hello ${hello}&quot;</span> <span class="hljs-keyword">as</span> title 
<span class="hljs-keyword">as</span> <span class="hljs-keyword">output</span>;
</code></pre>
<p>&#x8FD9;&#x91CC;&#xFF0C;&#x6211;&#x4EEC;&#x5F15;&#x5165;&#x4E86;&#x4E00;&#x4E2A;&#x4E0B;&#x4E2A;&#x7AE0;&#x8282;&#x624D;&#x4F1A;&#x4ECB;&#x7ECD;&#x7684;select&#x8BED;&#x6CD5;&#xFF0C;&#x4E0D;&#x8FC7;&#x56E0;&#x4E3A;select&#x8BED;&#x6CD5;&#x76F8;&#x5F53;&#x7B80;&#x5355;&#xFF0C;&#x672C;&#x8D28;&#x5C31;&#x662F;&#x5C31;&#x662F;&#x4F20;&#x7EDF;&#x7684;SQL [select&#x8BED;&#x53E5; + as + &#x8868;&#x540D;]&#x3002;&#x5927;&#x5BB6;&#x73B0;&#x5728;&#x53EA;&#x8981;&#x8BB0;&#x4F4F;&#x8FD9;&#x4E2A;&#x89C4;&#x5219;&#x5C31;&#x53EF;&#x4EE5;&#x4E86;&#x3002;&#x6211;&#x4EEC;&#x901A;&#x8FC7;SQL&#x8BED;&#x53E5;&#x5C06;&#x53D8;&#x91CF;&#x8F93;&#x51FA;,&#x5F97;&#x5230;&#x7ED3;&#x679C;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code>title

hello world
</code></pre><p>&#x901A;&#x5E38;&#xFF0C; &#x53D8;&#x91CF;&#x53EF;&#x4EE5;&#x7528;&#x4E8E;&#x4EFB;&#x4F55;&#x8BED;&#x53E5;&#x7684;&#x4EFB;&#x4F55;&#x90E8;&#x5206;&#x3002;&#x751A;&#x81F3;&#x53EF;&#x4EE5;&#x662F;&#x7ED3;&#x679C;&#x8F93;&#x51FA;&#x8868;&#x540D;&#xFF0C;&#x6BD4;&#x5982;&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;</p>
<pre><code class="lang-sql">
<span class="hljs-keyword">set</span> hello=<span class="hljs-string">&quot;world&quot;</span>;

<span class="hljs-keyword">select</span> <span class="hljs-string">&quot;hello William&quot;</span> <span class="hljs-keyword">as</span> title 
<span class="hljs-keyword">as</span> <span class="hljs-string">`${hello}`</span>;

<span class="hljs-keyword">select</span> * <span class="hljs-keyword">from</span> world <span class="hljs-keyword">as</span> <span class="hljs-keyword">output</span>;
</code></pre>
<p>&#x6211;&#x4EEC;&#x770B;&#x5230;&#xFF0C;&#x6211;&#x4EEC;&#x5E76;&#x6CA1;&#x6709;&#x663E;&#x5F0F;&#x7684;&#x5B9A;&#x4E49;world&#x8868;&#xFF0C;&#x4F46;&#x662F;&#x6211;&#x4EEC;&#x5728;&#x6700;&#x540E;&#x4E00;&#x53E5;&#x4F9D;&#x7136;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#xFF0C;&#x8FD9;&#x662F;&#x56E0;&#x4E3A;&#x7CFB;&#x7EDF;&#x6B63;&#x786E;&#x7684;&#x89E3;&#x6790;&#x4E86;&#x524D;&#x9762;&#x7684;${hello}&#x53D8;&#x91CF;&#x3002;</p>
<p>&#x56E0;&#x4E3A;&#x8868;&#x540D;&#x662F;&#x88AB;&#x8BED;&#x6CD5;&#x89E3;&#x6790;&#x683C;&#x5F0F;&#x9650;&#x5236;&#x7684;&#xFF0C;&#x6240;&#x4EE5;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x7528;``&#x5C06;&#x5176;&#x62EC;&#x8D77;&#x6765;&#xFF0C;&#x907F;&#x514D;&#x8BED;&#x6CD5;&#x89E3;&#x6790;&#x9519;&#x8BEF;&#x3002;</p>
<p>&#x503C;&#x5F97;&#x4E00;&#x63D0;&#x7684;&#x662F;&#xFF0C;set&#x8BED;&#x6CD5;&#x5F53;&#x524D;&#x7684;&#x751F;&#x547D;&#x5468;&#x671F;&#x662F;request&#x7EA7;&#x522B;&#x7684;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x6BCF;&#x6B21;&#x8BF7;&#x6C42;&#x6709;&#x6548;&#x3002;&#x901A;&#x5E38;&#x5728;MLSQL&#x4E2D;&#xFF0C;&#x751F;&#x547D;&#x5468;&#x671F;&#x5206;&#x6210;&#x4E09;&#x4E2A;&#x90E8;&#x5206;&#xFF1A;</p>
<ol>
<li>request &#xFF08;&#x5F53;&#x524D;&#x6267;&#x884C;&#x8BF7;&#x6C42;&#x6709;&#x6548;&#xFF09;</li>
<li>session  &#xFF08;&#x5F53;&#x524D;&#x4F1A;&#x8BDD;&#x5468;&#x671F;&#x6709;&#x6548;&#xFF09;</li>
<li>application &#xFF08;&#x5168;&#x5C40;&#x5E94;&#x7528;&#x6709;&#x6548;&#xFF09;</li>
</ol>
<p>&#x6211;&#x4EEC;&#x540E;&#x7EED;&#x7AE0;&#x8282;&#x4F1A;&#x8BE6;&#x7EC6;&#x63CF;&#x8FF0;&#x3002;</p>
<p>request&#x7EA7;&#x522B;&#x8868;&#x793A;&#x4EC0;&#x4E48;&#x542B;&#x4E49;&#x5462;&#xFF1F; &#x5982;&#x679C;&#x4F60;&#x5148;&#x6267;&#x884C;</p>
<pre><code class="lang-sql"><span class="hljs-keyword">set</span> hello=<span class="hljs-string">&quot;world&quot;</span>;
</code></pre>
<p>&#x7136;&#x540E;&#x518D;&#x5355;&#x72EC;&#x6267;&#x884C;</p>
<pre><code class="lang-sql"><span class="hljs-keyword">select</span> <span class="hljs-string">&quot;hello William&quot;</span> <span class="hljs-keyword">as</span> title 
<span class="hljs-keyword">as</span> <span class="hljs-string">`${hello}`</span>;

<span class="hljs-keyword">select</span> * <span class="hljs-keyword">from</span> world <span class="hljs-keyword">as</span> <span class="hljs-keyword">output</span>;
</code></pre>
<p>&#x7CFB;&#x7EDF;&#x4F1A;&#x63D0;&#x793A;&#x62A5;&#x9519;&#xFF1A;</p>
<pre><code>Illegal repetition near index 17
((?i)as)[\s|\n]+`${hello}`
                 ^
java.util.regex.PatternSyntaxException: Illegal repetition near index 17
((?i)as)[\s|\n]+`${hello}`
                 ^
java.util.regex.Pattern.error(Pattern.java:1955)
java.util.regex.Pattern.closure(Pattern.java:3157)
java.util.regex.Pattern.sequence(Pattern.java:2134)
java.util.regex.Pattern.expr(Pattern.java:1996)
java.util.regex.Pattern.compile(Pattern.java:1696)
java.util.regex.Pattern.&lt;init&gt;(Pattern.java:1351)
java.util.regex.Pattern.compile(Pattern.java:1028)
java.lang.String.replaceAll(String.java:2223)
tech.mlsql.dsl.adaptor.SelectAdaptor.analyze(SelectAdaptor.scala:49)
</code></pre><p>&#x7CFB;&#x7EDF;&#x627E;&#x4E0D;&#x5230;${hello}&#x8FD9;&#x4E2A;&#x53D8;&#x91CF;,&#x7136;&#x540E;&#x539F;&#x6837;&#x8F93;&#x51FA;&#xFF0C;&#x6700;&#x540E;&#x5BFC;&#x81F4;&#x8BED;&#x6CD5;&#x89E3;&#x6790;&#x9519;&#x8BEF;&#x3002;</p>
<h2 id="set&#x8BED;&#x6CD5;&#x7C7B;&#x578B;"><a name="set&#x8BED;&#x6CD5;&#x7C7B;&#x578B;" class="anchor-navigation-ex-anchor" href="#set&#x8BED;&#x6CD5;&#x7C7B;&#x578B;"><i class="fa fa-link" aria-hidden="true"></i></a>set&#x8BED;&#x6CD5;&#x7C7B;&#x578B;</h2>
<p>set &#x662F;&#x4E00;&#x4E2A;&#x76F8;&#x5F53;&#x7075;&#x6D3B;&#x7684;&#x8BED;&#x6CD5;&#x3002; &#x5728;MLSQL&#x4E2D;&#xFF0C;&#x6839;&#x636E;&#x4F5C;&#x7528;&#x7684;&#x4E0D;&#x540C;&#xFF0C;&#x6211;&#x4EEC;&#x5C06;set&#x533A;&#x5206;&#x4E3A;&#x4E94;&#x79CD;&#x7C7B;&#x578B;&#xFF1A;</p>
<ol>
<li>text</li>
<li>conf</li>
<li>shell</li>
<li>sql</li>
<li>defaultParam</li>
</ol>
<p>&#x7B2C;&#x4E00;&#x79CD;text&#x4E5F;&#x5C31;&#x662F;&#x6211;&#x4EEC;&#x524D;&#x9762;&#x5DF2;&#x7ECF;&#x6F14;&#x793A;&#x8FC7;&#x7684;&#xFF1A;</p>
<pre><code class="lang-sql"><span class="hljs-keyword">set</span> hello=<span class="hljs-string">&quot;world&quot;</span>;
</code></pre>
<p>&#x7B2C;&#x4E8C;&#x79CD;conf&#x8868;&#x793A;&#x8FD9;&#x662F;&#x4E00;&#x4E2A;&#x914D;&#x7F6E;&#x9009;&#x9879;&#xFF0C;&#x901A;&#x5E38;&#x7528;&#x4E8E;&#x914D;&#x7F6E;&#x7CFB;&#x7EDF;&#x7684;&#x884C;&#x4E3A;&#xFF0C;&#x6BD4;&#x5982; </p>
<pre><code class="lang-sql"><span class="hljs-keyword">set</span> spark.<span class="hljs-keyword">sql</span>.shuffle.<span class="hljs-keyword">partitions</span>=<span class="hljs-number">200</span> <span class="hljs-keyword">where</span> <span class="hljs-keyword">type</span>=<span class="hljs-string">&quot;conf&quot;</span>;
</code></pre>
<p>&#x8868;&#x793A;&#x5C06;&#x5E95;&#x5C42;spark&#x5F15;&#x64CE;&#x7684;shuffle&#x9ED8;&#x8BA4;&#x5206;&#x533A;&#x6570;&#x8BBE;&#x7F6E;&#x4E3A;200. &#x90A3;&#x4E48;&#x5982;&#x4F55;&#x5236;&#x5B9A;&#x8FD9;&#x662F;&#x4E00;&#x4E2A;&#x914D;&#x7F6E;&#x5462;&#xFF1F; &#x7B54;&#x6848;&#x5C31;&#x662F;&#x52A0;&#x4E0A;</p>
<pre><code class="lang-sql">where type=&quot;conf&quot;
</code></pre>
<p>&#x6761;&#x4EF6;&#x5B50;&#x53E5;&#x3002;</p>
<p>&#x7B2C;&#x4E09;&#x79CD;&#x662F;shell,&#x4E5F;&#x5C31;&#x662F;set&#x540E;&#x7684;key&#x6700;&#x540E;&#x662F;&#x7531;shell&#x6267;&#x884C;&#x751F;&#x6210;&#x7684;&#x3002; &#x6211;&#x4EEC;&#x5DF2;&#x7ECF;&#x4E0D;&#x63A8;&#x8350;&#x4F7F;&#x7528;&#x8BE5;&#x65B9;&#x5F0F;&#x3002;&#x5178;&#x578B;&#x7684;&#x4F8B;&#x5B50;&#x6BD4;&#x5982;&#xFF1A;</p>
<pre><code class="lang-sql"><span class="hljs-keyword">set</span> <span class="hljs-built_in">date</span>=<span class="hljs-string">`date`</span> <span class="hljs-keyword">where</span> <span class="hljs-keyword">type</span>=<span class="hljs-string">&quot;shell&quot;</span>;
<span class="hljs-keyword">select</span> <span class="hljs-string">&quot;${date}&quot;</span> <span class="hljs-keyword">as</span> dt <span class="hljs-keyword">as</span> <span class="hljs-keyword">output</span>;
</code></pre>
<p>&#x6CE8;&#x610F;&#xFF0C;&#x8FD9;&#x91CC;&#x9700;&#x8981;&#x4F7F;&#x7528;`` &#x62EC;&#x4F4F;&#x8BE5;&#x547D;&#x4EE4;&#x3002;
&#x8F93;&#x51FA;&#x7ED3;&#x679C;&#x4E3A;&#xFF1A;</p>
<pre><code class="lang-sql">dt

Mon Aug 19 10:28:10 CST 2019
</code></pre>
<p>&#x7B2C;&#x56DB;&#x79CD;&#x662F;sql&#x7C7B;&#x578B;&#xFF0C;&#x8FD9;&#x610F;&#x5473;&#x7740;set&#x540E;&#x7684;key&#x6700;&#x540E;&#x662F;&#x7531;sql&#x5F15;&#x64CE;&#x6267;&#x884C;&#x751F;&#x6210;&#x7684;&#x3002;&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x53EF;&#x4EE5;&#x8BA9;&#x5927;&#x5BB6;&#x770B;&#x51FA;&#x5176;&#x7279;&#x70B9;&#x548C;&#x7528;&#x6CD5;&#xFF1A;</p>
<pre><code class="lang-sql"><span class="hljs-keyword">set</span> <span class="hljs-built_in">date</span>=<span class="hljs-string">`select date_add(1) as set date=`</span><span class="hljs-keyword">select</span> <span class="hljs-keyword">date_sub</span>(<span class="hljs-keyword">CAST</span>(<span class="hljs-keyword">current_timestamp</span>() <span class="hljs-keyword">as</span> <span class="hljs-built_in">DATE</span>), <span class="hljs-number">1</span>) <span class="hljs-keyword">as</span> dt<span class="hljs-string">` 
where type=&quot;sql&quot;;

select &quot;${date}&quot; as dt as output;
</span></code></pre>
<p>&#x6CE8;&#x610F;&#x8FD9;&#x91CC;&#x4E5F;&#x9700;&#x8981;&#x4F7F;&#x7528;`` &#x62EC;&#x4F4F;&#x547D;&#x4EE4;&#x3002; &#x6700;&#x540E;&#x7ED3;&#x679C;&#x8F93;&#x51FA;&#x4E3A;&#xFF1A;</p>
<pre><code>dt

2019-08-18
</code></pre><p>&#x6700;&#x540E;&#x4E00;&#x79CD;&#x662F;defaultParam&#xFF0C;&#x6211;&#x4EEC;&#x5148;&#x770B;&#x793A;&#x4F8B;&#x3002;</p>
<pre><code class="lang-sql"><span class="hljs-keyword">set</span> hello=<span class="hljs-string">&quot;foo&quot;</span>;
<span class="hljs-keyword">set</span> hello=<span class="hljs-string">&quot;bar&quot;</span>;

<span class="hljs-keyword">select</span> <span class="hljs-string">&quot;${hello}&quot;</span> <span class="hljs-keyword">as</span> <span class="hljs-keyword">name</span> <span class="hljs-keyword">as</span> <span class="hljs-keyword">output</span>;
</code></pre>
<p>&#x6700;&#x540E;&#x8F93;&#x51FA;&#x662F;</p>
<pre><code>name

bar
</code></pre><p>&#x8FD9;&#x7B26;&#x5408;&#x5927;&#x5BB6;&#x76F4;&#x89C9;&#xFF0C;&#x4E0B;&#x9762;&#x7684;&#x4F1A;&#x8986;&#x76D6;&#x4E0A;&#x9762;&#x7684;&#x3002;&#x90A3;&#x5982;&#x679C;&#x6211;&#x60F3;&#x8FBE;&#x5230;&#x8FD9;&#x4E48;&#x4E00;&#x79CD;&#x6548;&#x679C;&#xFF0C;&#x5982;&#x679C;&#x53D8;&#x91CF;&#x5DF2;&#x7ECF;&#x8BBE;&#x7F6E;&#x4E86;&#xFF0C;&#x6211;&#x5C31;&#x4E0D;&#x8BBE;&#x7F6E;&#xFF0C;&#x5982;&#x679C;&#x53D8;&#x91CF;&#x6CA1;&#x6709;&#x88AB;&#x8BBE;&#x7F6E;&#x8FC7;&#xFF0C;&#x6211;&#x5C31;&#x4F5C;&#x4E3A;&#x9ED8;&#x8BA4;&#x503C;&#x3002;&#x4E3A;&#x4E86;&#x8FBE;&#x5230;
&#x8FD9;&#x4E2A;&#x6548;&#x679C;&#xFF0C;MLSQL&#x5F15;&#x5165;&#x4E86;defaultParam&#x7C7B;&#x578B;&#xFF1A;</p>
<pre><code class="lang-sql"><span class="hljs-keyword">set</span> hello=<span class="hljs-string">&quot;foo&quot;</span>;
<span class="hljs-keyword">set</span> hello=<span class="hljs-string">&quot;bar&quot;</span> <span class="hljs-keyword">where</span> <span class="hljs-keyword">type</span>=<span class="hljs-string">&quot;defaultParam&quot;</span>;

<span class="hljs-keyword">select</span> <span class="hljs-string">&quot;${hello}&quot;</span> <span class="hljs-keyword">as</span> <span class="hljs-keyword">name</span> <span class="hljs-keyword">as</span> <span class="hljs-keyword">output</span>;
</code></pre>
<p>&#x6700;&#x540E;&#x8F93;&#x51FA;&#x7ED3;&#x679C;&#x662F;&#xFF1A;</p>
<pre><code>name

foo
</code></pre><p>&#x5982;&#x679C;&#x524D;&#x9762;&#x6CA1;&#x6709;&#x8BBE;&#x7F6E;&#x8FC7;hello=&quot;foo&quot;,</p>
<pre><code class="lang-sql"><span class="hljs-keyword">set</span> hello=<span class="hljs-string">&quot;bar&quot;</span> <span class="hljs-keyword">where</span> <span class="hljs-keyword">type</span>=<span class="hljs-string">&quot;defaultParam&quot;</span>;

<span class="hljs-keyword">select</span> <span class="hljs-string">&quot;${hello}&quot;</span> <span class="hljs-keyword">as</span> <span class="hljs-keyword">name</span> <span class="hljs-keyword">as</span> <span class="hljs-keyword">output</span>;
</code></pre>
<p>&#x5219;&#x8F93;&#x51FA;&#x7ED3;&#x679C;&#x4E3A;</p>
<pre><code>name

bar
</code></pre><h2 id="set&#x8BED;&#x6CD5;&#x7F16;&#x8BD1;&#x65F6;&#x548C;&#x8FD0;&#x884C;&#x65F6;"><a name="set&#x8BED;&#x6CD5;&#x7F16;&#x8BD1;&#x65F6;&#x548C;&#x8FD0;&#x884C;&#x65F6;" class="anchor-navigation-ex-anchor" href="#set&#x8BED;&#x6CD5;&#x7F16;&#x8BD1;&#x65F6;&#x548C;&#x8FD0;&#x884C;&#x65F6;"><i class="fa fa-link" aria-hidden="true"></i></a>set&#x8BED;&#x6CD5;&#x7F16;&#x8BD1;&#x65F6;&#x548C;&#x8FD0;&#x884C;&#x65F6;</h2>
<p>MLSQL&#x6709;&#x975E;&#x5E38;&#x5B8C;&#x5584;&#x7684;&#x6743;&#x9650;&#x4F53;&#x7CFB;&#xFF0C;&#x53EF;&#x4EE5;&#x8F7B;&#x677E;&#x63A7;&#x5236;&#x4EFB;&#x4F55;&#x6570;&#x636E;&#x6E90;&#x5230;&#x5217;&#x7EA7;&#x522B;&#x7684;&#x8BBF;&#x95EE;&#x6743;&#x9650;&#xFF0C;&#x800C;&#x4E14;&#x521B;&#x65B0;&#x6027;&#x7684;&#x63D0;&#x51FA;&#x4E86;&#x7F16;&#x8BD1;&#x65F6;&#x6743;&#x9650;&#xFF0C;
&#x4E5F;&#x5C31;&#x662F;&#x901A;&#x8FC7;&#x9759;&#x6001;&#x5206;&#x6790;MLSQL&#x811A;&#x672C;&#x4ECE;&#x800C;&#x5B8C;&#x6210;&#x8868;&#x7EA7;&#x522B;&#x6743;&#x9650;&#x7684;&#x6821;&#x9A8C;&#xFF08;&#x5217;&#x7EA7;&#x522B;&#x4F9D;&#x7136;&#x9700;&#x8981;&#x8FD0;&#x884C;&#x65F6;&#x5B8C;&#x6210;&#xFF09;&#x3002;</p>
<p>&#x4F46;&#x662F;&#x7F16;&#x8BD1;&#x671F;&#x6743;&#x9650;&#x6700;&#x5927;&#x7684;&#x6311;&#x6218;&#x5728;&#x4E8E;set&#x53D8;&#x91CF;&#x7684;&#x89E3;&#x6790;&#xFF0C;&#x6BD4;&#x5982;&#xFF1A;</p>
<pre><code class="lang-sql"><span class="hljs-keyword">select</span> <span class="hljs-string">&quot;foo&quot;</span> <span class="hljs-keyword">as</span> foo <span class="hljs-keyword">as</span> foo_table;
<span class="hljs-keyword">set</span> hello=<span class="hljs-string">`select foo from foo_table`</span> <span class="hljs-keyword">where</span> <span class="hljs-keyword">type</span>=<span class="hljs-string">&quot;sql&quot;</span>;
<span class="hljs-keyword">select</span> <span class="hljs-string">&quot;${hello}&quot;</span> <span class="hljs-keyword">as</span> <span class="hljs-keyword">name</span> <span class="hljs-keyword">as</span> <span class="hljs-keyword">output</span>;
</code></pre>
<p>&#x5982;&#x679C;&#x6211;&#x4EEC;&#x6CA1;&#x6709;&#x771F;&#x7684;&#x8FD0;&#x884C;&#x7B2C;&#x4E00;&#x4E2A;&#x53E5;&#x5B50;&#xFF0C;&#x90A3;&#x4E48;set&#x8BED;&#x6CD5;&#x5C31;&#x65E0;&#x6CD5;&#x6267;&#x884C;&#x3002;&#x4F46;&#x662F;&#x56E0;&#x4E3A;&#x662F;&#x7F16;&#x8BD1;&#x671F;&#xFF0C;&#x6240;&#x4EE5;&#x6211;&#x4EEC;&#x80AF;&#x5B9A;&#x4E0D;&#x4F1A;&#x771F;&#x5B9E;&#x8FD0;&#x884C;&#x7B2C;&#x4E00;&#x4E2A;&#x53E5;&#x5B50;&#xFF0C;&#x8FD9;&#x5C31;&#x4F1A;&#x5BFC;&#x81F4;&#x6267;&#x884C;&#x5931;&#x8D25;&#x3002;
&#x6839;&#x672C;&#x539F;&#x56E0;&#x662F;&#x56E0;&#x4E3A;set&#x4F9D;&#x8D56;&#x4E86;&#x8FD0;&#x884C;&#x65F6;&#x624D;&#x4F1A;&#x4EA7;&#x751F;&#x7684;&#x8868;&#x3002;</p>
<p>&#x4E3A;&#x4E86;&#x89E3;&#x51B3;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#xFF0C;&#x6211;&#x4EEC;&#x5F15;&#x5165;&#x4E86; compile/runtime &#x4E24;&#x4E2A;&#x6A21;&#x5F0F;&#x3002;&#x5982;&#x679C;&#x4F60;&#x5E0C;&#x671B;&#x4F60;&#x7684;set&#x8BED;&#x53E5;&#x53EF;&#x4EE5;&#x7F16;&#x8BD1;&#x65F6;&#x5C31;evaluate&#x503C;&#xFF0C;&#x90A3;&#x4E48;&#x6DFB;&#x52A0;&#x8BE5;&#x53C2;&#x6570;&#x5373;&#x53EF;&#x3002;</p>
<pre><code class="lang-sql"><span class="hljs-keyword">set</span> hello=<span class="hljs-string">`select 1 as foo `</span> <span class="hljs-keyword">where</span> <span class="hljs-keyword">type</span>=<span class="hljs-string">&quot;sql&quot;</span> <span class="hljs-keyword">and</span> <span class="hljs-keyword">mode</span>=<span class="hljs-string">&quot;compile&quot;</span>;
</code></pre>
<p>&#x5982;&#x679C;&#x4F60;&#x5E0C;&#x671B;&#x4F60;&#x7684;set&#x503C;&#xFF0C;&#x53EA;&#x5728;&#x8FD0;&#x884C;&#x65F6;&#x624D;&#x9700;&#x8981;&#xFF0C;&#x5219;&#x8BBE;&#x7F6E;&#x4E3A;runtime:</p>
<pre><code class="lang-sql"><span class="hljs-keyword">set</span> hello=<span class="hljs-string">`select 1 as foo `</span> <span class="hljs-keyword">where</span> <span class="hljs-keyword">type</span>=<span class="hljs-string">&quot;sql&quot;</span> <span class="hljs-keyword">and</span> <span class="hljs-keyword">mode</span>=<span class="hljs-string">&quot;runtime&quot;</span>;
</code></pre>
<p>&#x7F16;&#x8BD1;&#x671F;&#x6211;&#x4EEC;&#x4E0D;&#x4F1A;&#x8FD0;&#x884C;&#x8FD9;&#x4E2A;set&#x8BED;&#x53E5;&#x3002;</p>
<h2 id="&#x5185;&#x7F6E;&#x53D8;&#x91CF;"><a name="&#x5185;&#x7F6E;&#x53D8;&#x91CF;" class="anchor-navigation-ex-anchor" href="#&#x5185;&#x7F6E;&#x53D8;&#x91CF;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x5185;&#x7F6E;&#x53D8;&#x91CF;</h2>
<p>MLSQL &#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E9B;&#x5185;&#x7F6E;&#x53D8;&#x91CF;&#xFF0C;&#x770B;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code class="lang-sql"><span class="hljs-keyword">set</span> jack=<span class="hljs-string">&apos;&apos;&apos;
 hello today is:${date.toString(&quot;yyyyMMdd&quot;)}
&apos;&apos;&apos;</span>;
</code></pre>
<p>date&#x662F;&#x5185;&#x7F6E;&#x7684;&#xFF0C;&#x4F60;&#x53EF;&#x4EE5;&#x7528;&#x4ED6;&#x5B9E;&#x73B0;&#x4E30;&#x5BCC;&#x7684;&#x65E5;&#x671F;&#x5904;&#x7406;&#x3002;</p>
<h2 id="&#x56DE;&#x987E;"><a name="&#x56DE;&#x987E;" class="anchor-navigation-ex-anchor" href="#&#x56DE;&#x987E;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x56DE;&#x987E;</h2>
<p>&#x8FD9;&#x4E2A;&#x7AE0;&#x8282;&#x6709;&#x70B9;&#x590D;&#x6742;&#xFF0C;&#x539F;&#x56E0;&#x662F;&#x56E0;&#x4E3A;set&#x8BED;&#x6CD5;&#x7684;&#x7075;&#x6D3B;&#x6027;&#x5DF2;&#x7ECF;&#x529F;&#x80FD;&#x5F88;&#x5F3A;&#x5927;&#x3002;&#x4F46;&#x662F;&#x7528;&#x6237;&#x53EA;&#x8981;&#x638C;&#x63E1;&#x57FA;&#x672C;&#x7528;&#x6CD5;&#x5DF2;&#x7ECF;&#x8DB3;&#x591F;&#x6EE1;&#x8DB3;&#x9700;&#x6C42;&#x4E86;&#x3002;</p>
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